fix: MongoDB database switch, dotted collection names, and shell parser

[datlechin]

Summary

• Fix Cmd+K database switch not updating sidebar collections for MongoDB connections
• Fix dotted collection names (e.g. system.version) being misparsed in shell syntax
• Add bracket notation (db["collection"]) support and db-level method handling to MongoShellParser

Changes

Database switch fix

• MongoDBDriver.connection changed from let to private(set) var with switchDatabase(to:) method
• Coordinator now updates driver + metadata driver connection before session update
• Added .refreshData notification post (matching PostgreSQL branch)
• SidebarViewModel uses forceLoadTables() from notifications to prevent race conditions with stale schemaProvider cache

Dotted collection name support

• Parser now splits on last . before first ( instead of first ., so db.system.version.find() correctly parses as collection=system.version
• All MongoDB query generation converted to bracket notation db["collection"] across MongoDBStatementGenerator, TableOperations, QueryTab, ExportService, and MongoDBDriver DDL

Shell parser improvements

• Added parseBracketExpression() for db["collection"].method() syntax
• Added parseDbLevelMethod() for db.getCollectionNames(), db.listCollections(), db.createCollection(), db.dropDatabase(), db.version(), db.stats()
• Added guard for db. with empty collection name

Test plan

• 96 MongoShellParser tests pass (65 new)
• 32 MongoDBStatementGenerator tests pass (3 updated for bracket notation)
• 199 total MongoDB tests pass
• Manual: connect to MongoDB, switch database via Cmd+K, verify sidebar refreshes
• Manual: open a dotted collection (e.g. system.version), verify CRUD operations work

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Reject trailing tokens in db-level method parsing

parseDbLevelMethod parses the parenthesized argument but ignores the returned remainder, so malformed input like db.dropDatabase()foo is accepted and executed as a real dropDatabase command instead of throwing syntax error. This is especially dangerous for destructive db-level operations introduced in this change, because a typo after ) can still run the command.

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[chatgpt-codex-connector]

Prevent canceled table loads from overwriting fresh sidebar data

forceLoadTables() cancels the previous task and immediately starts a new load, but the canceled task is not awaited and loadTablesAsync() has no cancellation guard before writing tables. If the first fetch completes after the replacement fetch (e.g., during MongoDB database switching), stale results can overwrite the newly loaded table list and reintroduce the wrong sidebar state.

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